Activation of Chain Processes in Combustible Mixtures by Laser Excitation of Molecular Vibrations of Reactants

Lukhovitskii, B. I.; Starik, A. M.; Титова, Н. С.

doi:10.1007/s10573-005-0047-6

Cited by 18 publications

(11 citation statements)

References 10 publications

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“…Early experimental studies of the effect of O 3 on ignition delay times were conducted in compression and spark ignition engines [30][31][32][33][34]. Recently, laser ignition has also been investigated by using both CO 2 and KrF excimer lasers to excite and decompose O 3 [35][36][37]. To the authors' knowledge, there have only been two investigations of the effect of O 3 on flame propagation enhancement [32,38].…”

Section: Introductionmentioning

confidence: 99%

Flame propagation enhancement by plasma excitation of oxygen. Part I: Effects of O3

Ombrello

Won

et al. 2010

Combustion and Flame

284

155

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Section: Introductionmentioning

confidence: 99%

Flame propagation enhancement by plasma excitation of oxygen. Part I: Effects of O3

Ombrello

Won

et al. 2010

Combustion and Flame

284

155

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“…, n, where n is the number of modes of molecules in the mixture). Based on the modal distribution, thermally nonequilibrium models were constructed to describe the processes behind strong shock waves propagating in air [21,22] and the processes of ignition due to excitation of molecular vibrations of the reagents in H 2 -O 2 -O 3 mixtures [16,17,23], which provided fairly good agreement with experimental data.…”

Section: Formulation Of the Problem And Kinetic Modelmentioning

confidence: 88%

“…An important parameter of the model of mode kinetics is the vibrational energy of the molecule formed in an elementary chemical reaction. In the present work, its value was determined in the same manner as it was done in [23].…”

Section: Formulation Of the Problem And Kinetic Modelmentioning

confidence: 99%

Initiation of combustion of a CH4-O2 mixture in a supersonic flow with excitation of O2 molecules by an electric discharge

Starik

Lukhovitskii

Титова

2008

Combust Explos Shock Waves

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The possibility of intensification of ignition of a methane-oxygen mixture in a supersonic flow behind the front of an oblique shock wave by means of excitation of O 2 molecules to the states a 1 Δ g and b 1 Σ + g in an electric discharge is discussed. Through numerical simulations, activation of O 2 molecules by an electric discharge is demonstrated to speed up chain reactions in the CH 4 -O 2 mixture and to reduce the induction-zone length. Even a small amount of energy input to O 2 molecules in the discharge (≈3 ·0 −2 J/cm 3 ) can reduce the ignition-delay length by a factor of hundreds and initiate combustion at distances of ≈1 m from the discharge zone at comparatively low temperatures of the gas behind the front (≈1000 K) and moderate pressures (≈10 5 Pa). Excitation of O 2 molecules by an electric discharge is much more efficient than simple heating of the mixture.

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“…For discharges at low reduced electric fields, low-energy excitation, such as vibrational excitation or excitation of lower electronic states, 153 is dominant. So, paper 154 proposed a kinetic mechanism where electronically excited oxygen molecules in a 1 ∆ g and b 1 Σ + g -states are the main components responsible for enhanced combustion efficiency.…”

Section: 152mentioning

confidence: 99%

Plasma-assisted combustion

Starikovskii

Anikin

Kosarev

et al. 2006

Pure and Applied Chemistry

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)12-03-2007 REPORT TYPE Final Report DATES COVERED (From -To AUTHOR(S)Professor Andrei Y Starikovskii 5e. WORK UNIT NUMBER PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Moscow Institute of Physics and Technology 9 Institutski Lane Dolgoprudny 141700 Russia PERFORMING ORGANIZATION REPORT NUMBERN/A SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)EOARD PSC 821 BOX 14 FPO AE 09421-0014 SPONSOR/MONITOR'S REPORT NUMBER(S)CRDF 02-9003 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTThis report results from a contract tasking Moscow Institute of Physics and Technology as follows: The contractor will investigate the use of high voltage, nano-second plasma discharges to ignite and efficiently combust fuel/air mixtures in high speed flows. This strongly nonequilibrium low-temperature plasma has a high mean energy of electrons and will provide a source of reactive atoms, radicals, and excited molecules which has been shown to enhance ignition and combustion. The short duration of the pulses results in relatively low power requirements for generating the discharge. The goal is to demonstrate and understand the physics of energy exchange, ignition and combustion . Also, the use of this type of plasma for aerodynamic flow control will be investigated. Finally, applicability to use this type of discharge to directly initiate a detonation wave will be investigated. Chapter 1 SUBJECT TERMS AbstractA review was made which discusses different types of the discharges applied for plasma assisted ignition and combustion. Special attention to experimental and theoretical analysis of some plasma parameters was given, such as reduced electric field, electron density and energy branching for different gas discharges. Streamers, pulsed nanosecond discharges, dielectric barrier discharges, radio frequency discharges, atmospheric pressure glow discharges are considered. Detailed measurements of the parameters of a streamer flash development in the air for the pressure range 90-1300 Torr have been carried out in the plane-to-plane geometry for 20-42 ...

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Activation of Chain Processes in Combustible Mixtures by Laser Excitation of Molecular Vibrations of Reactants

Cited by 18 publications

References 10 publications

Flame propagation enhancement by plasma excitation of oxygen. Part I: Effects of O3

Flame propagation enhancement by plasma excitation of oxygen. Part I: Effects of O3

Initiation of combustion of a CH4-O2 mixture in a supersonic flow with excitation of O2 molecules by an electric discharge

Plasma-assisted combustion

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